Key to species of the Rhyssinae in Ukrainian Carpathians

1. Clypeus with apical tubercle (fig. 3, 1). Metasoma always with white coloration. OTI 4.5–5.0. Rhyssa . .... 4

— Clypeus without apical tubercle, weakly concave (fig. 3, 2). If metasoma with white coloration, than OTI at least 8.0. .. ................................................................................................................................................................... 2

2. Paramere without a groove paralleling its inner edge. Tergites 3–6 of male moderately concave apically, without a median longitudinal submembranous area. Metasoma entirely black. Tergites 3–5 of female transversely aciculate Rhyssella .. ........................................................................................................................ 3

— Paramere with a strong groove close to and paralleling the apical 0.7 of its lower inner edge. Tergites 3–6 of male strongly concave apically and with a median apical longitudinal submembranous area. Mesosoma always with, metasoma with (female) or without (male) white coloration. Tergites 3–5 of female smooth.. ...................................................................................................................................................... Megarhyssa rixator

3. Scutellum black. ................................................................................................................ Rhyssella approximator

— Scutellum yellow. ..................................................................................................................... Rhyssella obliterata

4. Females. ..................................................................................................................................................................... 5

— Males (male of Rhyssa kriechbaumeri is unknown). ........................................................................................... 7

5. Face black, at most with two central white spots (fig. 4, 1). Propodeum black (fig. 4, 2). ................................ ................................................................................................................................................. Rhyssa kriechbaumeri

— Face black centrally, at least with two white stripes on eye orbits (fig. 5, 1). Propodeum at least with two lateral white spots (fig. 5, 2). ................................................................................................................................... 6

6. Central flagellomeres whitish. Clypeus yellow. .......................................................................... Rhyssa amoena

— Antennal flagellum without a pale band. Clypeus from reddish-brown to black. ........... Rhyssa persuasoria

7. Clypeus, scape and pedicel (fig. 6, 2), fore and mid coxae, trochanters and trochantelli yellow. .................... ............................................................................................................................................................ Rhyssa amoena

— Clypeus from reddish-brown to black. Scape and pedicel black (fig. 6, 1). At least mid coxa and trochanter with red and/or black spots. .................................................................................................... Rhyssa persuasoria